>>>>>>Sometimes getdiskserial fails. It means that returns empty string. It depends on the user. But with the same user (poweruser), in different computer (in the same network) does the job. I can have the correct string, changing the user (as administrator works), but the poweruser has ( or so it seems) the complete control. I do not understand this behavior.
>>>>>>Sombody can help me to solve this problem?
>>>>>>Thnx in advance
>>>>>
>>>>>Don't use diskserial for copy protect. Use ethernet ID for that. That's a more reliable way.
>>>>You mean the MAC address, I suppose.
>>>>
>>>>Peter
>>>
>>>Yes... Cetin said that "MAC address can be changed, too", but it's hard to do for an average user.
>>
>>I really don't know ethernet ID. Is it easy to use and where to search ?
>
>I can't remembered who gived me this function, it works good:
>
>

>Local pGUID,rGUID
>Declare integer CoCreateGuid in 'OLE32.dll' ;
>  string @pguid
>Declare integer StringFromGUID2 in 'OLE32.dll' ;
>  string rguid, string @lpsz, integer cchMax
>
>pGUID=replicate(chr(0),16)
>rGUID=replicate(chr(0),80)
>
>If "5." $ OS() && 2000/XP
>  Declare integer UuidCreateSequential in 'RPCRT4.dll'  string @ Uuid
>  lcMacAddress = iif( UuidCreateSequential(@pGUID) = 0 ;
>    and StringFromGUID2(pGUID,@rGUID,40) # 0, ;
>    substr(StrConv(left(rGUID,76),6),26,12), "" )
>* VFP7
>*  CLEAR DLLS 'UuidCreateSequential'
>Else
>  lcMacAddress = iif( CoCreateGuid(@pGUID) = 0 ;
>    and StringFromGUID2(pGUID,@rGUID,40) # 0, ;
>    substr(StrConv(left(rGUID,76),6),26,12), "" )
>ENDIF
>? lcMacAddress
>*VFP7
>*CLEAR DLLS 'WNetGetUser','GetComputerName','CoCreateGuid','StringFromGUID2'
>
>

hi,
I think i use that code only to find it returned only 1 MAc address. If a Bluetooth was installed then You couldnt get LAN card address. These Bluetooth dongals can be removed and put as and when required making it error while reading when the Dongal is present or not

Suhashegde